Dry cough is divided into internal dryness and external dryness, and the specific treatment methods are as follows: 1. External dryness is divided into warm dryness and cool dryness, all from climatic factors, such as dryness is due to dryness caused by heat, it is called warm dryness, and the traditional cough remedy for warm dryness is called Sang Ju Drink. Cool dryness is due to cool, dry climate, no qi happens, and it causes external dryness, and its treatment formula is called Xing Su San. Therefore, the two most important prescriptions to solve external dryness are called Sang Ju Drink and Xing Su San. 2, internal dryness is divided into deficiency and reality, for the reality of internal dryness, which is caused by the inability to pass stool, it is called Yang Ming internal dryness and Yang Ming dryness. Another aspect of internal dryness is caused by deficiency, deficiency caused by internal dryness can be supplemented, that is, to supplement the fluid, such as roasted licorice soup is a very good formula.